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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |
Schedule of expected useful lives of property and equipment |
Buildings |  | 20 years
Leasehold improvements |  | Over the shorter of the lease term or their estimated useful lives
Machinery |  | 5-10 years
Furniture, fixtures and equipment |  | 5 years
Motor vehicles |  | 5 years
Schedule of useful life intangible assets |
Power purchase agreement ("PPA") |  | Over the estimated useful lives
Technical know-how |  | 10 years
Computer software |  | 1-10 years
Schedule of disaggregation of revenue |
|  | Years Ended December 31,
|  | 2016 |  | 2017 |  | 2018
|  | (In Thousands of U.S. Dollars)
MSS segment: |  |  |  |  |  |
Revenue recognized at a point in time |  | 2,742,518 |  | 2,705,985 |  | 2,095,743
Revenue recognized over time |  | 4,128 |  | 6,938 |  | 73,175
Energy segment: |  |  |  |  |  |
Revenue recognized at a point in time |  | 25,755 |  | 633,195 |  | 1,542,906
Revenue recognized over time |  | 80,677 |  | 44,275 |  | 32,688
|  | 2,853,078 |  | 3,390,393 |  | 3,744,512
Schedule of contract assets and contract liabilities |
|  | At December 31, 2017 |  | At December 31, 2018 |  | Fluctuation |  | % |
|  | (In Thousands of U.S. Dollars, except percentages) |
Contract Assets |  |  |  |  |  |  |  |  |
Accounts receivables, unbilled |  | 1,253 |  | 38 |  | 1,215 |  | 3,197 | %
Contract Liabilities |  |  |  |  |  |  |  |  |
Advances from customers |  | 51,739 |  | 39,024 |  | 12,715 |  | 33 | %
Deferred revenue |  | 47,854 |  | 51,381 |  | (3,527) |  | (7) | %
|  | 99,593 |  | 90,405 |  | 9,188 |  | 10 | %
Summary of the Company's other operating income, net |
|  | Years Ended December 31,
|  | 2016 |  | 2017 |  | 2018
|  | $ |  | $ |  | $
Net gain on disposal of solar power system |  | (47,899) |  | (27,803) |  | (36,098)
Net loss on disposal of property, plant and equipment |  | 8,094 |  | 1,960 |  | 2,565
Government grants |  | (2,734) |  | (6,473) |  | (11,013)
Business interruption insurance compensation |  | — |  | (15,238) |  | —
|  | (42,539) |  | (47,554) |  | (44,546)
Schedule of gross prepayments made to individual suppliers in excess of 10% of total advances to suppliers |
|  | At December 31, |  | At December 31,
|  | 2017 |  | 2018
|  | $ |  | $
Supplier A |  | 18,260 |  | 18,260

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- Definition Tabular disclosure of the extent of the entity's reliance on its major suppliers, if prepayments with a single supplier amount to 10 percent or more of entity prepayments, including the disclosure of that fact, the total amount of prepayments from each such supplier. + References No definition available. + Details
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